Dynamoelectric machine



Sept. 30, 1947. H. MAXWELL 2,428,236

DYNAMO -ELECTRIC MACHINE Original Filed ma 28, 1943 Irfivencor-Q HowardMaxwell,

Hns Attor-hey.

Patented Sept. 30, 1947 as PATENT OFFICE amass v I nrmmosmcraromcmn,;Ilow a rdMaxwell,,N.Y.,alllgnrto 'General Electric Company, a

New York corporaflon of nor-inns! application May a, 194:, Serial No.

My invention relates to dynamoelectric machines and particularly to suchmachines wherein' it is desirable to enclose the stator core and windingsej'la'rately from the rotatable member of the machinar.

, This application is, a division or my application,

, teaser... mvlaauna this application 1:, 1945,8erlalNo. 009,452;

' 4 Claims. (01.171-252) Serial No. 488,863, ,flled May 28, 1943, andasinventiontwill pointed outwith particularity in the claims annexed'toand forming Daft of this specification,

In the drawing, Fig. 1 is an end view partly broken away, showing anembodiment of my invention; Fig. 2 is a sectional side view taken along1-4 oil-Fig. 1; Fig. 3 is a sectional partial end 'viewofja furtherembodiment of my improved "dynamoelectric machine construction, and Pig.4-is'a tragmentary view taken along line 44oil ig.2;

Referringto the drawing, I have shown a dynamoelectric machine which isadapted to be used in locations where the medium which surrounds themachine may be injurious to either or both the stator core and winding11 it ispermitted to come in contact therewith. The machine illustratedis an induction motor provided with a con ventional laminated rotor coreI having a. squirrel cage winding 2 therein and supported ona shaft 8.The stationary member of the machine is provided with a core 4 formed oflaminations of magnetic material having winding slots formed therein inwhich a winding 8 is arranged. The stationary member core 4 is mountedin a shell or frame 1 arranged about the outer side or the laminationsand is held in position in the frame I by a pair of retaining end rings8 arranged in engagement with the outer laminations 1 of the core andsecured to the frame I in any suitable manner, as y welding. Thelaminations of the, stationary member core 4 and the winding 4 arearranged within an enclosure which includes end plates 9 secured to thestator frame or shell I and provided with a relatively thin tubularmember II, preferably of material having a relatively high; resistance,which extends between the end plates 8 and is secured thereto in ugusttherewith, so that the laminations and the winding 8' are enclosed in asubstantially fluid-tight housing. The tubular member" is formed with aplurality of longitudinally or axially extending circumferentiallyspaced apart integrally formed corrugations II on the outer sidethereof. These corrugations are formed with slightly larger outerportions than the inner portions near the tubular member Ill. and extendoutwardly into the narrow open ends or the winding slots 5 in the coreand in the illustrated construction extend into contact with slotinsulation I! about the winding -6. This provides for retaining thewinding and slot insulation in position and assures locking the tubularmember ID securely to the laminated core 4 and in good thermal contactwith the ends of teeth It to provide for good interchange of heattherebetween. The outer end portions l4 of the corrugations II are shownclosed together as by pressing and secured to- .gether and .to endplates 9 by a fluid tight seal in any suitable manner,'as by welding, orbrazing. These ends l4 may be secured directly to the end plate as to aflange 15 thereof or to a thin cylinder II secured to the end plate 9 toform a fluidtight enclosure with the shell 'I about the winding 8 andthe core 4. This construction provides a compact and reinforced air-gapenclosure.

Fig. 3 illustrates a further embodiment of my invention, wherein axiallyextending circumferentially spaced apart, projections are formed as ribsII, welded, brazed, or otherwise suitably secured to an inner tubular orcylindrical member l8. These ribs I! extend within the outer open endsof winding slots IS in the core 4 and into good thermal contact with theadjacent ends of the teeth It. The ends of the enclosing tubular memberI! are secured to the shell end plates 8 by suitable fluid-tight jointssuch as those shown in Fig. 2 and provide substantially the sameadvantages of that construction and is made of simple structuralelements. The projecting ribs ll might also be made with larger andtapered wedge-shaped outer portions to lock the inner member I. to thecore 4 as in Fig. 1.

While I have illustrated and described particular embodiments of myinvention, modifications thereof will occur to those skilled in the art.I desire it to be understood, therefore, that my invention is not to belimited to the particular arrangements disclosed, and I intend in theappended claims to cover all modifications which do not depart from thespirit and scope of my invenany suitable manner to form a fluid-tightJoint 66 tion.

What I claim as new and desir to secure by Letters Patent of the UnitedStates is:

1. A dynamoelectric machine including a rotatable member and astationary member having a core formed of laminations with winding slotstherein, a winding in said winding slots, an enclosure extending about aportion of said core and said winding including a relatively thintubular member extending between said core and said rotatable member,and means including projections on said tubular member extending axiallybeing formed with wider outer 19,

and outwardly into said core for transferringheat between said tubularmember and said laminations and for retaining said winding in saidwinding slots.

said tubular member extending into said core for retaining said windingin said windin slots and for transferring heat between said tubularmember and said laminations, said projections being formed with widerouter portions for locking said tubular member to said core.

- ..15- 2. A dynamoelectric machine including a ro-- lar memberextending between said core and said rotatable member, and meansincluding axially extending projections formed as corrugations on saidtubular member extending outwardly into slots in said core forstiffening said tubular memher and for retaining said winding in saidwinding slots and for transferring heat between said tubular member andsaid laminations, said projections portions for locking said tubularmember to said core.

4. A dynamoelectric machine including a rotatable member and astationary member having a core formed of laminations with winding slotstherein, a winding in said winding slots, an enclosure extending about aportion of said core and said winding including a tubular memberextending between said core and said rotatable member, and meansincluding axially extending projections on said tubular member extendingin circumferentially spaced apart relationship into said core by way ofsaid winding slots for retaining said winding in said winding slots andfor c transferring heat between said tubular member 3. A dynamoelectricmachine including a rotatable member and a stationary member having acore formed of laminations with winding slots 35 therein, a winding insaid winding slots, an

enclosure extending about a portion of said core and said windingincluding a relatively thin tubuand said laminations, said projectionsextending from the outer side of said tubular member substantially intoengagement with elements of said winding.

HOWARD MAXWELL REFERENCES CITED The following references are of recordin the file of this patent:

UNITED STATES PATENTS

